Multiple choice

A man allows a discount of 10% on a book whose marked price is Rs. 40. What is the cost price so that the profit is 20%?

  1. Rs. 35

  2. Rs. 40

  3. Rs. 30

  4. Rs. 45
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The marked price is 40 and the discount is 10%, so the selling price is 40 - 4 = 36. With a 20% profit, the cost price is 36 / 1.2 = 30.

AI explanation

Using the marked price and discount formula, the selling price is 40*(1-0.10) = Rs. 36. Since this selling price includes a 20% profit over the cost price (CP), the equation is 1.2*CP = 36. Solving for CP gives CP = 36/1.2 = 30.

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